研究目的
To design and construct a novel ternary Cu2O/BiVO4/RGO photocatalyst with enhanced photocatalytic and surface adsorption performances for the degradation of tetracycline (TC) in water under visible light irradiation.
研究成果
The ternary Cu2O/BiVO4/RGO photocatalyst demonstrates significantly enhanced adsorption capacity (23.73 times higher than pure BiVO4) and photocatalytic degradation efficiency (81.2% TC degradation in 60 min) under visible light, attributed to the synergistic effects of Cu2O and RGO in broadening light absorption, improving charge separation, and increasing surface adsorption. The main active species is superoxide radical (·O2-), and the catalyst shows good stability over multiple cycles. This work provides a novel approach for designing efficient adsorption-photocatalysts for water purification.
研究不足
The study may have limitations in scalability for industrial applications, potential oxidation of Cu2O affecting stability over long periods, and the need for further optimization of mass ratios for maximum efficiency. The use of specific chemicals and equipment could limit reproducibility in other settings.
1：Experimental Design and Method Selection:
The study employs hydrothermal and evaporation-induced methods to synthesize the photocatalyst, aiming to enhance visible light absorption and electron-hole pair separation through heterojunction formation and synergistic effects.
2：Sample Selection and Data Sources:
Samples include pure BiVO4, RGO/BiVO4 composites with varying RGO mass ratios (
3：5%, 1%, 2%, 3%), Cu2O concave cubes, and ternary Cu2O/BiVO4/RGO composites with varying Cu2O mass ratios (1%, 3%, 5%). Tetracycline (TC) aqueous solution (20 mg/L) is used as the pollutant. List of Experimental Equipment and Materials:
Equipment includes field emission scanning electron microscopy (Nova Nano SEM 450, FEI), transmission electron microscopy (JEM-2100, JEOL), X-ray diffractometer (D/max-RA, Rigaku), photoluminescence spectrophotometer (Cary Eclipse, VARIAN), UV-vis spectrometer (Shimadzu UV-3600), BET surface area analyzer, UV-vis spectrophotometer (Cary 5000, Agilent), electrochemical workstation (CHI 760D, CH Instruments), and ESR spectrometer. Materials include Bi(NO3)3·5H2O, NH4VO3, SDBS, GO, CuCl2, SDS, NaOH, NH2OH·HCl, ethanol, and TC.
4：Experimental Procedures and Operational Workflow:
Synthesis involves hydrothermal methods for BiVO4 and RGO/BiVO4, precipitation for Cu2O, and evaporation-induced method for Cu2O/BiVO4/RGO. Characterization includes SEM, TEM, XRD, PL, UV-vis DRS, BET, XPS, photocurrent response, EIS, adsorption tests, and photocatalytic degradation under visible light with a 250 W Xenon lamp and 420 nm cutoff filter.
5：Data Analysis Methods:
Data analysis involves calculating band gaps from UV-vis spectra, kinetic constants from degradation rates, and using software for spectral deconvolution and electrochemical measurements.
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